Transistor part # cross reference needed

I have a transistor which exploded [epoxy resin case ruptured] due to a
power surge. It from the power supply circuit in a Toshiba TV, model 20A42,
chassis M3L714, mfg date August 2002. The component designation on the
circuit board is Q504.

The following text is present on the back side of the transistor:

K-232
C3198
Y

I don't have a current Philips/ECG semi-conductor cross reference guide on
hand, and I have not yet identified a local electronics component retailer
to go to [other than Radio Shack]. AFAIK, the appearance of the component
leads me to believe that it is one of the common transistor types and I
might even be able to get a replacement at Radio Shack if I knew what the
actual transistor type/designation was.

Advertisements

Chuck Chopp wrote:
> I have a transistor which exploded [epoxy resin case ruptured] due to a
> power surge. It from the power supply circuit in a Toshiba TV, model
> 20A42, chassis M3L714, mfg date August 2002. The component designation
> on the circuit board is Q504.
>
> The following text is present on the back side of the transistor:
>
> K-232
> C3198
> Y
>
> I don't have a current Philips/ECG semi-conductor cross reference guide
> on hand, and I have not yet identified a local electronics component
> retailer to go to [other than Radio Shack]. AFAIK, the appearance of
> the component leads me to believe that it is one of the common
> transistor types and I might even be able to get a replacement at Radio
> Shack if I knew what the actual transistor type/designation was.
>
> Is there an online reference for these types of semi-conductors?

OK, making progress... I found the http://www.nteinc.com web site and a
lookup of C3198 returns NTE85, which is a general purpose NPN transistor.
Now I just need to turn this back into some sort of general purpose
transistor #, such as a 2N2222, etc.... Damn, but this gets confusing when
you haven't done any sort of hands-on hobbyist electronics in 17 years.

Advertisements

2SC3198
I doubt it would be a Radio Shack item.
You could order from MCM Electronics.
Bill
Christian Technology

"Chuck Chopp" <> wrote in message
news:abeVb.23276$...
> Chuck Chopp wrote:
>
> > I have a transistor which exploded [epoxy resin case ruptured] due to a
> > power surge. It from the power supply circuit in a Toshiba TV, model
> > 20A42, chassis M3L714, mfg date August 2002. The component designation
> > on the circuit board is Q504.
> >
> > The following text is present on the back side of the transistor:
> >
> > K-232
> > C3198
> > Y
> >
> > I don't have a current Philips/ECG semi-conductor cross reference guide
> > on hand, and I have not yet identified a local electronics component
> > retailer to go to [other than Radio Shack]. AFAIK, the appearance of
> > the component leads me to believe that it is one of the common
> > transistor types and I might even be able to get a replacement at Radio
> > Shack if I knew what the actual transistor type/designation was.
> >
> > Is there an online reference for these types of semi-conductors?
>
>
> OK, making progress... I found the http://www.nteinc.com web site and a
> lookup of C3198 returns NTE85, which is a general purpose NPN transistor.
> Now I just need to turn this back into some sort of general purpose
> transistor #, such as a 2N2222, etc.... Damn, but this gets confusing
when
> you haven't done any sort of hands-on hobbyist electronics in 17 years.
>
>
> --
> Chuck Chopp
>
> ChuckChopp (at) rtfmcsi (dot) com http://www.rtfmcsi.com
> ICQ # 22321532
> RTFM Consulting Services Inc. 864 801 2795 voice & voicemail
> 103 Autumn Hill Road 864 801 2774 fax
> Greer, SC 29651 800 774 0718 pager
> 8007740718 (at) skytel (dot) com
>
> Do not send me unsolicited commercial email.
>

Chuck Chopp:
An NTE 85 is a general purpose NPN silicon transistor in a T0-92 epoxy
case.... similar in fact to the slightly lower voltage/current 2n2222a,
2n3904 or 2n4401, which I have found to work OK in most circuits.. A more
exact replacement would be a very common 2sC945 or 2sC1815. Just be
certain to watch the lead arrangement for the proper BCE connections as they
do vary with some otherwise satisfactory substitutions..
And the good news is that the mps2222a (equivalent to a 2n2222a) is
available at Radio Shack, catalog # 276-2009...... so are the mps3904 and
2n4401
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
-------------------------

snipped:
"Chuck Chopp" <> wrote in message
> OK, making progress... I found the http://www.nteinc.com web site and a
> lookup of C3198 returns NTE85, which is a general purpose NPN transistor.
> Now I just need to turn this back into some sort of general purpose
> transistor #, such as a 2N2222, etc.... Damn, but this gets confusing
when
> you haven't done any sort of hands-on hobbyist electronics in 17 years.
> Chuck Chopp
...
...
...
...

Dude -just order the NTE 85 tranny instead! NTE replacements are not
the greatest in the world, but for this particular one, it should be
fine (close enough). You can order these anywhere - www.mcminone.com,
digikey, mouser, it will be less than a dollar. Or go to any
electronics shop in your area - this should be a stock part - Tim

Chuck Chopp <> wrote in message news:<abeVb.23276$>...
> Chuck Chopp wrote:
>
> > I have a transistor which exploded [epoxy resin case ruptured] due to a
> > power surge. It from the power supply circuit in a Toshiba TV, model
> > 20A42, chassis M3L714, mfg date August 2002. The component designation
> > on the circuit board is Q504.
> >
> > The following text is present on the back side of the transistor:
> >
> > K-232
> > C3198
> > Y
> >
> > I don't have a current Philips/ECG semi-conductor cross reference guide
> > on hand, and I have not yet identified a local electronics component
> > retailer to go to [other than Radio Shack]. AFAIK, the appearance of
> > the component leads me to believe that it is one of the common
> > transistor types and I might even be able to get a replacement at Radio
> > Shack if I knew what the actual transistor type/designation was.
> >
> > Is there an online reference for these types of semi-conductors?
>
>
> OK, making progress... I found the http://www.nteinc.com web site and a
> lookup of C3198 returns NTE85, which is a general purpose NPN transistor.
> Now I just need to turn this back into some sort of general purpose
> transistor #, such as a 2N2222, etc.... Damn, but this gets confusing when
> you haven't done any sort of hands-on hobbyist electronics in 17 years.
>
>
> --
> Chuck Chopp
>
> ChuckChopp (at) rtfmcsi (dot) com http://www.rtfmcsi.com
> ICQ # 22321532
> RTFM Consulting Services Inc. 864 801 2795 voice & voicemail
> 103 Autumn Hill Road 864 801 2774 fax
> Greer, SC 29651 800 774 0718 pager
> 8007740718 (at) skytel (dot) com
>
> Do not send me unsolicited commercial email.

Sofie wrote:
> Chuck Chopp:
> An NTE 85 is a general purpose NPN silicon transistor in a T0-92 epoxy
> case.... similar in fact to the slightly lower voltage/current 2n2222a,
> 2n3904 or 2n4401, which I have found to work OK in most circuits.. A more
> exact replacement would be a very common 2sC945 or 2sC1815. Just be
> certain to watch the lead arrangement for the proper BCE connections as they
> do vary with some otherwise satisfactory substitutions..
> And the good news is that the mps2222a (equivalent to a 2n2222a) is
> available at Radio Shack, catalog # 276-2009...... so are the mps3904 and
> 2n4401

OK, I dug through my ancient box of spare parts and it turns out that I have
some 2n2222a transistors in a metal can [TO-18 ?] package. A quick look up
of the pin arrangement gave me what I needed to know about getting things
properly arranged to solder it back onto the circuit board. I used my
clip-on heat sink while soldering and reassembled everything. It looks like
I'm going to need to get a schematic and repair guide as there appears to be
additional problems. The power supply circuit is sufficiently repaired to
the point where the flyback transformer is whining very quietly [and it
didn't even do that before], but when I press the power button the TV does
not actually turn on.

Maybe it is just a lost cause and I shouldn't spend any more time on it. If
one of the SMD ICs on the circuit board got fried then it is pretty much
hopeless.

Chuck Chopp wrote:
> I have a transistor which exploded [epoxy resin case ruptured] due to a
> power surge. It from the power supply circuit in a Toshiba TV, model
> 20A42, chassis M3L714, mfg date August 2002. The component designation
> on the circuit board is Q504.
>
> The following text is present on the back side of the transistor:
>
> K-232
> C3198
> Y
>
> I don't have a current Philips/ECG semi-conductor cross reference guide
> on hand, and I have not yet identified a local electronics component
> retailer to go to [other than Radio Shack]. AFAIK, the appearance of
> the component leads me to believe that it is one of the common
> transistor types and I might even be able to get a replacement at Radio
> Shack if I knew what the actual transistor type/designation was.
>
> Is there an online reference for these types of semi-conductors?
>
>
> TIA,
>
> Chuck